Copyright 2014 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Copyright 2014 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Deputies block the entrances to Red Rocks following a shooting Thursday night.

Copyright 2014 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Investigators with flash lights at Red Rocks after 3 people were shot. Photo: Eric Lupher

Copyright 2014 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

DENVER - Deputies are looking for a gunman who opened fire on an SUV carrying a rapper and three others following a concert at Red Rocks Amphitheater Thursday night.

"The car was moving down the road of the amphitheater when the shots were fired," Jefferson County Sheriff's Office Spokesman Mark Techmeyer said Friday during the investigation.

A security guard was in the area of the Trading Post, near the shooting when it occurred. The guard was the first to report that a gunman stood up and opened fire on the Suburban with a rifle. After the shooting, the suspect walked away on a trail through the brush in the park.

"What we know of this point was that one of the performers was in that SUV. The performer was not injured," Techmeyer said. "The other three, who were injured, (we) don't know what their relationship was."

Later in the interview, Techmeyer identified the performer in the SUV as rapper Schoolboy Q. He had performed Thursday at the amphitheater, as did NAS and Flying Lotus.

The white Suburban drove away after the shooting but was eventually spotted and eventually stopped by Denver Police. But because it did not stop immediately, Techmeyer said those officers had to treat the situation as a "high risk stop."

When the vehicle did stop for officers near 6th Avenue and Kalamath, the precautions taken included putting at least one of the passengers in handcuffs. Techmeyer explained no one riding in the Suburban was charged and his department believes they were all victims in this case.

It is too early to know if Schoolboy Q was being specifically targeted, Techmeyer said, but no other vehicles or people were shot at.

Deputies were at Red Rocks on Friday morning with K-9's searching for evidence.

Authorities said they expected to finish their investigation and clear the crime scene Friday afternoon. Deputies are asking concerts goers for help with the investigation.

"Any concert goers in the area of the Trading Post or backstage from 9 -11 p.m., and were videotaping, call 303-271-5612 #JCSO #jeffco," officials said on Twitter.

Deputies told 7NEWS they only have a vague description of the suspect as a black man, approximately 6 foot tall, wearing black clothing and carrying a rifle.